Declaration of an ITAB in webdynpro

Hi All..

I am new to Webdynpro ABAP , so need ur help.

I have a structure "BAPI_PAYMITEM_CONTROL_POST_ITM" , and i tried to create an itab and work area fr it. I declared them as :

DATA ITAB TYPE BAPI_PAYMITEM_CONTROL_POST_ITM. DATA WA TYPE BAPI_PAYMITEM_CONTROL_POST_ITM.

But it is giving me the error :

"ITAB" is not an internal table "OCCURS n" specification is missing.

Please help out..